1. Laboratory of Civil Engineering and Mechanics, National Advanced School of Engineering, University of Yaoundé I, Yaoundé, Cameroon
2. Institute of Wood Technology, University of Yaoundé I, Mbalmayo, Cameroon
3. Laboratory L3E: Energy, Water and Environment, National Advanced School of Engineering, University of Yaoundé I, Yaoundé, Cameroon
4. University of Bordeaux, Talence Cedex, France